Cement for eyeglass-mountings.



STATES PATENT OFFICE.

3..UHLEMANN, OF CHICAGO, ILLINOIS.

cmmn'r for. EYEGLASS-MOUNTINGS.

No Drawing.

To all'whom it may concern Be it known that I, WILLIAM R. UHLE- MANN, a citizen of the United States of America, and-a resident .of Chicago, in'the county of Cook, State of Illinois, have in-' m tal clips to the lenses of eyeglasses, and

with which the removal of any excess of the composition can be effected without scratching or ma l-ring of the surface of the lenses, all as will hereinafter more fully appear.

The present composition or cement, comprises a combination of a pulverulent resinous gum capable of fusion .by heat, such as commercial m shellac, a finely powdered metal forme by grinding to a powder very thin sheets of metal or metal alloys, and a line earthy body, such as commercial talc,

mixed in suitable proportions, preferably as fifteen parts, by weight; bronze leaf powder, eight parts, by weight talc, ten parts, by weight.

The above mentioned finely powdered metal is generally known and has an extensive sale in the market, under trade terms such as F rench leaf bronze powder and like descriptive names indicative of the derivation of the powders.

' The different ingredients are thoroughly mixed by any usual'means, and when required for use, the desired amount of the mixture is placed betweenithe inner surfaces of the box clip and the edgeof the lens of an eyeglass after which heat is applied to effect a fusion of the mixture and attain an adhesion of the same to the immediately adjoining surfaces of the clip and lens.

From extended practical experiment with the present cement composition, it has been found that a very effective adhesion be- Specification of we Patent.

Patented Apr. 27, 1915.

Application filed May 1. 1914. Serial No. 835,731.

tween the cement and the metallic surface of the\clip, and the vitreous substance of the lens is attained. The strength of such adhesion being such that under destruction tests, the glass of the lens immediately adjacent to the box clip will pull apart before such adhesion is overcome.

Having thus fully described my said in-' I I vention what I claim as new and desire to secure by Letters Patent, is

1. The herein described composition for cementing box-clips toeyeglass lenses, consisting of approximately fifteen parts fusible gum, eight parts finely powdered metal, and ten parts finely divided earthy matter.

2. The herein described composition for cementing box-clips to eyeglasslenses, con--v sisting of approximately fifteen parts gum shellac, eight parts leaf bronze powder, and

ten parts finely divided earthy matter.

3. The herein described composition for cementing box-clips to eyeglass lenses, consisting of approximately fifteen parts fusi-' ble gum, eight arts finely powdered metal,

and ten parts ely divided talc.

. 4. The herein described composition for cementin box-clips to eyeglass lenses, consisting 0 approximately fifteen parts gum shellac, eight parts leaf bronze powder, and ten parts finely divided talc.

5. The method of cementing box-clips 'to eyeglass lenses which consists in" taking a composition consisting of approximately fifteen parts fusible gum, eight parts finely powdered metal and ten parts finely divided earthy'matter,'thoroughly the ingredients of the composition toget er, placingthe desired amount of the composition between the inner surface-of the box-clip and the edge of the eyeglass and finally applying heat to efi'ect a fusion of the composition and attain an adhesion of the same to the immediately adjoining surfaces of the clig and the lens.

. igned at Chicago, Illinois, this 28 day of April, 1914. WILLIAM R. UHLEMANN.

Witnesses:

ROBERT BURNS, HYDE W. PERCE. 

